Crowcon FGard IR3
Installation, Operating and Maintenance Instructions
Flame detector IR3 (FGard IR3) – FD-AC-07
Issue 1: February 21
IR3 Flame Detector
2
3
Contents
1 Introduction ................................................................................................................................................................................. 5
1.1 Detector Features ............................................................................................................................................................ 5
2 Safety Instructions ..................................................................................................................................................................... 6
2.1 Specific conditions of use .............................................................................................................................................. 6
2.2 Cautions .............................................................................................................................................................................. 6
2.3 Important Safety Notices ................................................................................................................................................ 6
2.4 EN 54-part 10 Limitation of use ................................................................................................................................... 8
3 Installation .................................................................................................................................................................................... 8
3.1 Detector Enclosure .......................................................................................................................................................... 8
3.2 Mounting & Orientation .................................................................................................................................................. 8
3.3 Wiring Procedure ........................................................................................................................................................... 10
3.4 0-20mA Output ............................................................................................................................................................... 11
3.5 Relay Output .................................................................................................................................................................... 12
3.6 Internal Inter-connections ............................................................................................................................................ 13
3.7 Installation Checklist ...................................................................................................................................................... 14
3.7.1 Mechanical ............................................................................................................................................................. 14
3.7.2 Electrical .................................................................................................................................................................. 14
4 System Design Guidelines ..................................................................................................................................................... 15
4.1 Power Supply................................................................................................................................................................... 15
4.2 Cable Selection ............................................................................................................................................................... 15
4.3 DC Power ......................................................................................................................................................................... 15
5 Application Guidelines ............................................................................................................................................................ 16
5.1 Positioning Requirements ............................................................................................................................................ 16
5.2 Detection Coverage ....................................................................................................................................................... 17
5.3 Exposure to Flare Radiation ......................................................................................................................................... 17
5.4 Optical Contamination ................................................................................................................................................... 17
5.5 Enclosed Areas ............................................................................................................................................................... 17
5.6 Detector Sensitivity ........................................................................................................................................................ 17
5.7 Detector Alarm Delay .................................................................................................................................................... 17
6 Maintenance and Commissioning ....................................................................................................................................... 19
6.1 Procedure ......................................................................................................................................................................... 19
6.2 Functional Testing .......................................................................................................................................................... 21
7 Fault Finding .............................................................................................................................................................................. 22
7.1 Removal of the Electronics........................................................................................................................................... 22
7.2 Replacement of the Electronics .................................................................................................................................. 22
4
7.3 Diagnostics ...................................................................................................................................................................... 22
7.4 LED Indication ................................................................................................................................................................. 23
7.5 Power Fault ...................................................................................................................................................................... 24
8 Technical Specification ........................................................................................................................................................... 25
8.1 Detector Information ..................................................................................................................................................... 25
8.2 Electrical Specification .................................................................................................................................................. 25
8.3 Mechanical Specification ............................................................................................................................................. 25
8.4 Environmental Specification ......................................................................................................................................... 25
8.5 Certification and Approvals ......................................................................................................................................... 26
8.6 Operating Specification ................................................................................................................................................ 26
8.7 FGard IR3 Detector Ordering Information ............................................................................................................... 27
8.8 Detector Accessories and Spares ............................................................................................................................. 27
9 Appendix A - Acronyms, Terms & Abbreviations ........................................................................................................... 28
10 Appendix B - Help us to help you. ................................................................................................................................. 29
11 Appendix C - Field of View ............................................................................................................................................... 30
12 Appendix D - FM Approval Performance Report ....................................................................................................... 31
13 Appendix E – Marine Certification. ................................................................................................................................. 33
14 Appendix F - IEC 61508 Failure Rate Data .................................................................................................................. 34
5
1 Introduction
This safety and technical manual applies to the Crowcon IR3 Flame Detector (FGard IR3) hardware version 1.0
and above.
The Crowcon FGard IR3 is a (triple) IR flame detector. It uses three IR sensors, digital signal processing
hardware and firmware algorithms to interpret the radiant characteristics of flame.
FM Approvals ensures that our flame detection firmware and hardware is fit for purpose through rigorous
research and testing to a range of fire types and various potential false alarm stimuli. This testing proves that the
FGard IR3 has an unsurpassed false alarm immunity.
The FGard IR3 has been designed for use in standalone operation.
1.1 Detector Features
• The FGard IR3 has a 90° cone of vision with a range of 60 metres to a 0.1m
2
pan fire of n-heptane.
• Three detection sensitivity settings allowing the user to select the sensitivity that is most suitable for their
application.
• Superior false alarm immunity to common sources of unwanted alarms such as hot process and hot
work.
• Advanced optical verification test assuring readiness to perform when needed.
• Outputs include both relay contacts and 0-20mA.
• Separate termination chamber for ease of installation.
• Certified Flame Simulator FGard SIM verifies operation from distances of 3 to 8 metres.
• FGard IR3 can operate via a standard 3 or 4 wire termination.
• Microprocessor controlled heated optics increases resistance to moisture and ice.
6
2 Safety Instructions
For the correct and effective use of this equipment, to maintain safety and avoid hazards it is essential that you
read and understand these instructions fully and act accordingly BEFORE installing, operating, or maintaining the
equipment.
PAY ATTENTION TO ALL SAFETY WARNINGS AND CAUTIONS
2.1 Specific conditions of use
This equipment is certified and intended for use in potentially hazardous areas. Install and use the equipment in
accordance with the latest regulations. The end user shall close any unused entries using suitably certified
blanking elements to maintain the housing’s type of protection.
For European (ATEX) installations IEC/EN60079-14 ‘Electrical Installations in Hazardous Areas’ and
ICE/EN60079-17 ‘Inspection and Maintenance in Hazardous Areas’ should be strictly observed. The IR3 type
flame detector; Crowcon FGard IR3, is to be installed in places where there is a low risk of mechanical damage.
For installations in North America the National Electrical Code (NEC) should be strictly observed. In other
countries the appropriate local or national regulations should be observed.
The equipment must be properly earthed to protect against electrical shock and minimise electrical interference.
Do not drill holes in any housing or enclosure as this will invalidate the explosion protection. Ensure that the
enclosure lid is fully tightened and locked into position before energising the equipment.
Do not open the enclosure in the presence of an explosive atmosphere.
All permits and proper site procedure and practices must be followed, and the equipment must be isolated from
the power supply before opening the enclosure in the field.
Operators must be properly trained and aware of what actions to take in the event of a fire being detected.
Cable to be used for installation is to be selected with a temperature rating of greater than 25 degrees Celsius
above the maximum ambient temperature. The metric cable entries are fitted with an internal stop. This will result
in threads of the cable gland being visible. Do not over tighten.
2.2 Cautions
Use only approved parts and accessories with this equipment.
Do not attempt to replace the window as the sapphire and the front cover are individually matched pairs to meet
the stringent requirement of the hazardous area certification.
The threaded portions of the detector are flame paths. These threads and the flame paths are not to be repaired.
To maintain safety standards, commissioning and regular maintenance should be performed by a qualified
person.
2.3 Important Safety Notices
Pay attention to the guidelines given throughout this document.
If in any doubt about the instructions listed within this manual, then please contact Crowcon. Crowcon takes no
responsibility for installation and/or use of its equipment if it is not in accordance with the appropriate issue
and/or amendment of the manual. Crowcon reserve the right to change or revise the information contained
herein without notice and without obligation to notify any person or organisation of such action.
7
Only those parameters and configurations highlighted with the FM diamond ( ) have been tested and
approved by Factory Mutual.
Warning
Do not open the detector assembly in a hazardous area. The detector contains limited serviceable components
and should only be opened by trained personnel.
Caution
The wiring procedures in this manual are intended to ensure functionality of the device under normal conditions.
Due to the many variations in wiring codes and regulations, total compliance to these ordinances cannot be
guaranteed. Be certain that all wiring complies with all local ordinances. If in doubt, consult the authority having
jurisdiction before wiring the system. Installation must be done by trained personnel.
Caution
To prevent unwanted actuation or alarm, extinguishing devices must be inhibited/isolated prior to performance
testing or maintenance.
Detector Orientation
Detectors should be mounted with the earth stud directly below the lens.
Detector Positioning
Detectors should be positioned to provide the best unobstructed view of the area to be protected.
The following factors should also be taken into consideration:
Identify all high-risk fire ignition sources. Ensure that enough detectors are used to adequately cover the
hazardous area.
Locate and position the detector so that the fire hazard(s) are within both the field of view and detection range
of the device.
For best performance, the detector should be mounted on a rigid surface in a low vibration area.
Extremely dense fog or blizzard conditions could eventually block the vision of the detector.
For indoor applications, if dense smoke is expected to accumulate at the onset of a fire, mount the detector on a
side wall (approximately 1 to 2 metres) below the ceiling.
The FGard IR3 has three sensitivity settings, which may be changed via a Crowcon application.
The flame detector carries out continuous internal hardware diagnostic testing to ensure correct operation is
relayed to the control system.
The FGard IR3 is not designed to annunciate diagnostic failure of signal returns via external wiring. Control
systems and fire panels generally have fault monitoring for such an eventuality.
8
2.4 EN 54-part 10 Limitation of use
The FGard IR3 is not approved for use in oxygen-enriched atmospheres.
As the FGard IR3 responds to flame, it cannot be used in locations where flare stacks are within its field of view
or a reflected view is present without triggering alarms.
As the FGard IR3 responds to CO
2
emissions of a flame the FGard IR3 cannot detect non-hydrocarbon fires,
such as those using pure hydrogen, silane, and sulphur as fuel.
The sensitivity of the FGard IR3 is reduced by obscurants such as smoke, fog, and other airborne particulates.
The FGard IR3 may be blinded by extremely dense obscurants.
Arc welding should not take place within 10m of the FGard IR3 when using the highest sensitivity setting.
3 Installation
The FGard IR3 design has been developed to allow simple installation. The detector comprises two key
components, the detector enclosure, and the detector internal assembly. The detector assembly located in the
front of the enclosure should not be removed except by trained personnel. Unauthorised removal or disassembly
of the detector assembly will invalidate the warranty. Only the rear end cap can be removed for terminal access.
3.1 Detector Enclosure
The detector electronics are housed in an enclosure certified for use in hazardous areas. For the exact
certification and conditions of use see certification label on the device, or the example drawing below:
The enclosure comprises the front window cover including the window part number 3303.8004, the rear
enclosure cover part number 2301.6009, the enclosure body part number 2301.6007, certification rating label
(see above) part number 3303.6008.04, and the mounting bracket Part Number 2301.6012.
3.2 Mounting & Orientation
The mounting bracket allows the detector’s vertical orientation to be adjusted from 0 to 45° and allows a
horizontal rotation of +/-45° when mounted from above.
Figure 1: Detector Mounting Bracket
9
Figure 2: Ceiling Mount
Figure 3: Wall Mount
Firm, vibration free mountings are essential for trouble free operation of optical systems and the detector should
be fixed to a rigid mounting. When mounting on a wall in this orientation allow for the cable gland and cable as
this may restrict the downward rotation of the detector.
10
3.3 Wiring Procedure
The wiring terminals are in the rear section of the detector enclosure and are accessible by removal of the end
cap.
The front section of the enclosure should only be accessed by trained personnel.
The terminal schematic detailed below shows the view looking inside the detector following removal of the end
cap.
Figure 4: Terminal Schematic
The detector has two types of alarm output available simultaneously.
• 0-20mA (source non-isolated)
• Relay (Alarm & Fault)
Listed below are wiring options dependent on the functional requirements of the detector.
11
3.4 0-20mA Output
The following wiring connection diagram shows correct wiring of the detector when a 0-20mA output is
required.
Figure 5: 3 Wire Termination
Factory Fixed Values
Current Output
Event
0mA
Power/Detector Fault
1mA
Low Supply Voltage Fault
1.5mA
Optical Fault
4mA
Healthy
18mA
Alarm
21mA
Over-range
Notes:
Note 1 - The tolerance on the above outputs is +/- 0.3mA current with a maximum loop resistance of 500
ohms.
Note 2 – Additional 0-20mA values are configurable and must be specified when ordering if required. The
optical fault signal may be configured at 2mA as opposed to 1.5mA and the alarm signal may be increased to
20mA.
Note 3 - The FGard IR3 can be factory-configured with an Aux alarm delay (20mA) of between 0 and 10
seconds in 1 second steps over and above the normal response times of the 18mA alarm signal. If the Aux
alarm signal is delayed, the 18mA alarm signal will precede the 20mA signal giving the normal response times
as tested by Factory Mutual to FM3260. If the 20mA alarm signal is delayed, it is considered an Aux alarm
level.
Note 4 – The 0-20mA signal has HART ® 7 protocol superimposed on top of it to give access to more
diagnostic information. See HART ® 7 Technical Note.
12
3.5 Relay Output
The following wiring connection diagrams shows wiring the detector when a relay output is required. Reversal of
polarity across terminals 1 & 2 enables Crowcon RS485 communication on terminals 3 & 4. This communication
protocol when used with Crowcon applications allows configuration changes to the detector.
Figure 6: Relay Configuration Termination
NOTE: EOL and alarm resistors values are defined by the client and the control system/fire
panel which the detectors are being integrated into.
13
3.6 Internal Inter-connections
The following diagram shows the internal inter-connections of the alarm and fault relay contacts and jumpers.
Each field connection is listed on this diagram for clarity.
Figure 7: FGard IR3 Internal Inter-connections
FGard IR3
FGard IR3
FGard IR3
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3.7 Installation Checklist
Experience has shown that poor installation and commissioning practice may result in an unreliable fire detection
system that fails to meet the site performance targets. Before installing the detector, it is important to consider
where it is to be located and how it is to be mounted. To maintain compliance with the EMC regulations it is
essential the electrical installation be engineered correctly.
3.7.1 Mechanical
Notes
When locating the detector consideration should be given to maintenance access to the
detector. The detector mounting should be secure and vibration free.
It is advisable to check the detection locations, prior to fabrication of the mounting supports, as
changes are frequently made during construction at site which can affect detector coverage.
The installation should allow space for subsequent detector removal, for maintenance or repair,
to be easily achieved.
1
The detector should be fixed to a stable supporting structure using the mounting bracket
provided. The supporting structure must allow for horizontal adjustment of the detector
orientation. The support structure should be in place prior to detector installation. Information on
mounting is available from Crowcon.
2
The threaded flame path of the enclosure cover and body must be protected from damage
during installation. Any such damage can destroy the validity of the enclosure.
3
The detector electronics shall be protected from mechanical damage and external sources of
EMI such as X-rays, RFI and electrostatic discharge. The detector should not face directly
towards the sun.
4
Fit the mounting bracket to the support structure using 8mm bolts (not provided). The detector
(bracket) should be oriented to provide the desired coverage.
5
The detector enclosure body should be fitted to the mounting bracket. The bolts locate into the
bracket. Twist the enclosure to locate the bolts; these are then tightened using a 6mm Allen key.
6
Ensure the detector is orientated such that the earthing stud is directly beneath the lens.
7
Glanding should be carried out by trained personnel. The gland should be fitted in line with
installation standards for potentially explosive atmospheres that is 5 full threads minimum with
the IP seal washer fitted at the bottom of the thread. This sealing arrangement will result in
several threads of the cable gland being visible. The gland should be torqued between 15 to 20
N m (11 to 15 lb ft).
Note – The IP seal washer only applies to metric threads.
3.7.2 Electrical
Notes
It is advisable to check the detection locations, prior to fabrication of the mounting supports, as
changes are frequently made during construction at site. Detector cabling must be segregated
from cables carrying high-speed data or high energy and/or high frequency signals and other
forms electrical interference. The detector requires a clear unobstructed view of the local
hazard. To avoid local obstructions, such as pipework and cable trays, a 2m helix should be
allowed in the detector cabling. The detector should only be fitted just prior to commissioning
the detector. Experience shows that the detector can be damaged due to cable testing
operations (Insulation Tests, etc.).
1
Isolate all associated power supplies. Ensure that they remain OFF until required for
commissioning.
15
2
The threaded flame path of the enclosure cover and body must be protected from damage
during installation. Any such damage can destroy the validity of the enclosure.
3
The electronics subassembly shall be protected from mechanical damage and external sources
of EMI such as X-rays, RFI and electrostatic discharge.
4 The enclosures external earth stud should be connected to a local earth point.
5
Remove the transit plug(s) from the enclosure body gland entries.
6
Fit approved cable glands.
4 System Design Guidelines
The following guidelines are intended to assist with the electrical design and engineering of systems where it is
intended that flame detectors will be used.
4.1 Power Supply
The detector requires an absolute minimum supply voltage of 18Vdc, as measured at the detector terminals. The
system power supply voltage and power distribution should be arranged such that on the longest cable run the
detector(s) has a supply voltage of greater than 18Vdc.
4.2 Cable Selection
Cable to be used for installation is to be selected with a temperature rating of greater than 25 degrees Celsius
above the maximum ambient temperature.
The metric cable entries are fitted with an internal stop. This internal stop has an IP washer mounted directly
above it. Ensure this is fitted to maintain the ingress protection. This will result in threads of the cable gland being
visible. Do not over tighten.
The installation and local regulations and standards determine the overall cable specification. This section
specifies suitable cable characteristics to ensure correct operation of the flame detector.
4.3 DC Power
NOTE: Table 2 shows an absolute maximum for cable length; try not to approach this value.
DO NOT ground any cable shields at the detector housing.
Table 2: Maximum Cable Lengths (24Vdc supply)
Installation based
on 24V nominal
supply
Number of Flame
Detectors
Maximum Power
(W)
Maximum Cable
Length (m) with
1.5mm2 Conductors
(12Ω/km)
Maximum Cable
Length (m)with
2.5mm2 Conductors
(7.6Ω/km)
Heater on
1
12W @ 24Vdc
500
780
Heater off
1
3W @ 24Vdc
2000
3000
16
Table 3: AWG Conversions
Cross Sectional Area (mm
2
)
American Wire Gauge (AWG)
Typical Conductor Resistance per km
(3280 ft.)
DC Ω/km @ 20°C (Approx.)
0.5
22
36
1.0
18
19
1.5
16
12
2.5
14
7.6
5 Application Guidelines
In considering the application of the detector it is important to know of any conditions that may prevent the
detector from responding. The detector provides reliable response to hydrocarbon flames within its field of view,
and insensitivity to common false alarm sources. Solid obstructions or a direct view of intense light sources may
result in a reduction in the coverage and/or a reduction in the detector sensitivity. Scaffolding or tarpaulins in the
detector’s field of view may reduce coverage. Contamination of the detector window may result in a reduction in
sensitivity.
The detector has a 90° conical field of view. The location and orientation of the detector in relation to the
protected area determines the actual footprint. Achieving the desired coverage depends on congestion within
the protected space, the location of the detector(s) and the distance of the detector from the hazard. It may be
necessary to install more than one detector within an area to achieve adequate coverage.
The detector sensitivity, expressed as fire size at a distance, is determined by the radiant heat output of the fire.
This is a function of the fuel source, how it is released and distance from the detector to the fire.
In common with other forms of flame detection the detector’s sensitivity is reduced and potentially blinded by
dense obscurants such as smoke, fog, and other airborne particulates. The detector is insensitive to arc welding;
however, this should not be conducted within 10m of the detector.
5.1 Positioning Requirements
The following guidelines have been based on operational feedback, reflecting commonly experienced problems
which can be traced to a failure to observe the following:
• Ensure the mounting position is free from vibration or movement.
• Prevent accidental knocking or forcing out of alignment.
• Isolate as far as possible from local electrical interference sources.
• Ensure sufficient detection to achieve adequate coverage for all likely hazards.
• Minimise exposure to contamination of the detector face plate.
• Ensure ease of maintenance access to detector (i.e., direct ladder or scaffold access).
• Do not allow the FGard IR3 to have direct view of hot surfaces.
• Ensure that the FGard IR3 has no direct view or reflected view of a friendly fire.
• The detector should be aimed downward by at least 10° to 20°.
All these issues are of crucial importance to a successful installation and they should be afforded great attention
during the detailed design, construction, and commissioning phases of the work.
17
5.2 Detection Coverage
Detector locations can be chosen from computer models or from site surveys. The detectors should be aligned
to view the intended hazard considering any obstruction and congestion. Software analysis of the actual detector
coverage may be required to ensure adequate coverage of the hazards. This analysis can also be used to
optimise the number of detectors and the loop configuration. The cones of vision are detailed in Appendix C.
5.3 Exposure to Flare Radiation
Flame detectors are frequently used where hydrocarbon fire hazards are expected; these are quite often
processing plants where a flare stack is in use nearby. The detector shall not have a direct view of the flare or a
reflected view of the flare.
5.4 Optical Contamination
There are many sources of contamination such as oil, water (deluge water, rain, and sea-spray), snow, ice, and
internal misting. Excessive contamination of the detector faceplate may result in an increased maintenance
requirement and potentially reduce the detector’s sensitivity. Where detectors are mounted at low level, care
should be taken to avoid contamination (such as water and oil) from equipment above the detector. Care should
be taken in sighting the detector to minimise the likelihood of such contamination. The detector is designed such
that an optical fault is generated when half of the detection range remains. This is indicated by the fault output
and is evident by the yellow colour of the LED on the face of the detector. The optical fault condition indicates
that the detector requires cleaning or service. The optical fault indication is self-clearing.
5.5 Enclosed Areas
In enclosed areas, if dense smoke is expected to accumulate at the onset of the fire, the detector should be
mounted 1 to 2 metres below the ceiling level.
5.6 Detector Sensitivity
The detector’s response to a fire is a function of the fuel source and how it is released, fire size and distance,
orientation to the detector and local ambient conditions. The typical figures are based on in-house tests except
when marked with the FM logo, these tests were conducted and certified by Factory Mutual. As with all tests
the results must be interpreted according to the individual application considering all possible variables.
The detector sensitivity to different fuel sources is dependent on the radiant heat output of the flame and the
detectors typical response is shown below (see table 4). The detector will only detect hydrocarbon fires.
5.7 Detector Alarm Delay
The Detector can be factory configured with an Aux alarm delay (20mA) of between 0 and 10 seconds in 1
second steps over and above the normal response times of the 18mA alarm signal. If the Aux alarm signal is
delayed the 18mA alarm signal will precede the 20mA signal giving the normal response times as tested by
Factory Mutual to FM3260. The 20mA alarm signal if delayed is considered an Aux alarm level.
18
Table 4: Typical FGard IR3 Response Characteristics High sensitivity (60 metres). For all FM
approved results see Appendix D
Fuel
Fire Size
Distance
FM
Methane Fire
0.6m plume height
50m (165 feet)
Ethanol Fire 0.3m x 0.3m pan 42m (136 feet)
Diesel Fire
0.3m x 0.3m pan
50m (165 feet)
Crude Oil (heavy fuel oil) Fire
0.3m x 0.3m pan
50m (165 feet)
Wax Inhibitor (Clear 10) Fire 0.3m x 0.3m pan 50m (165 feet)
Anti-Foam (Surflo AF-300) Fire
0.3m x 0.3m pan
50m (165 feet)
Wood Stack Fire 0.3m x 0.3m crib 50m (165 feet)
n-heptane Fire
0.3m x 0.3m pan
60m (200 feet)
n-heptane Fire in direct sunlight
0.3m x 0.3m pan
60m (200 feet)
n-heptane Fire in modulated sunlight 0.3m x 0.3m pan 60m (200 feet)
n-heptane Fire in the presence of Arc welding
0.3m x 0.3m pan
60m (200 feet)
n-heptane Fire in the presence of a 500-Watt lamp 0.3m x 0.3m pan 60m (200 feet)
Gasoline Fire
0.3m x 0.3m pan
60m (200 feet)
JP4 Fire
0.3m x 0.3m pan
60m (200 feet)
Methanol Fire 0.3m x 0.3m pan 42m (136 feet)
Jet A-1 Fire
0.3m x 0.3m pan
35m (115 feet)
19
6 Maintenance and Commissioning
6.1 Procedure
This maintenance schedule/ commissioning procedure is intended for guidance only. The actual level of
maintenance required will depend on the severity of the operating environment and the likelihood of damage or
the rate of contamination from oil, sea spray, deluge system etc. It is advisable to regularly review maintenance
reports and adapt the maintenance period to the operating environment.
20
Step
Periodic Inspection and Maintenance
Suggested Interval
1 - 6
General Inspection and maintenance of the detector and faceplate.
6 Monthly
6 - 14
Specific inspection and maintenance of the detector enclosure.
12 Monthly
16
Detector function testing.
6 Monthly
1 – 5
15 - 17
Commissioning Procedure. Post Installation
Step Activity Key Points
1
Detectors that require maintenance / commissioning should be taken
offline and inhibited. Detectors which require to be opened will need
to be isolated electrically.
Ensure that panel wiring,
and terminations
associated with all units
under test are in good
order.
2
Ensure that the detector mounting arrangements are secure and
undamaged.
3
Ensure that the detector enclosure is intact and undamaged.
4
Ensure that all associated cables and glands are correctly made up,
secure and undamaged.
5
Clean the enclosure faceplate (outside) with a mild detergent solution
and a soft cloth until the window is clear of all contamination. Wash
the window thoroughly with clean water and dry with a clean lint free
cloth or tissue.
Note: This MUST be carried out prior to initial powering of
the device. The FGard IR3 will carry out an automatic
Optical Test Calibration at this point.
Assess requirement for
opening the enclosure,
for maintenance or
cleaning, follow steps 6
to 14.
6
Open the detector enclosure if required, by removing the enclosure
cover. This exposes the enclosure flame path and detector lens.
Avoid damage to the
flame path, faceplate,
and lens.
7
Clean the enclosure cover and body flame paths with a dry clean
cloth to remove and contamination. If the flame path or threads are
badly pitted the components should be replaced.
8
Check the ‘O’ ring seal on the enclosure cover is not damaged or
perished, replace as required. Note the ingress protection is
compromised if the seal is not correct.
9
Clean the enclosure faceplate (inside) with a mild detergent solution
and a soft cloth until the window is clear of all contamination. Wash
the window thoroughly with clean water and dry with a clean lint free
cloth or tissue.
10
Non–setting waterproof grease should be evenly applied to the flame
path on both the enclosure cover and body.
11
Clean the detector lens. This should be done with a soft, dry, and
clean cloth.
Avoid touching the
optics or electronics.
12
Clean the detector enclosure faceplate. Use a degreasing agent on
the outside to remove deposits.
13
The enclosure cover must be screwed on to a minimum of 5 full turns
or until fully tight and secured using the locking screw provided.
14
Reinstate the detector back into service.
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